<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul{
            margin-top: 50px;
        }
        li{
            width: 300px;
            padding: 5px;
            background-color: rgb(245, 209, 243);
            color: red;
            font-size: 14px;
            margin: 15px 0;
        }
        li a{
            float: right;
        }
    </style>
</head>
<body>
    <textarea name="" id="">123</textarea>
    <button>发布</button>
    <ul>
    </ul>

    <script>
        var btn = document.querySelector('button');
        var text = document.querySelector('textarea');
        var ul = document.querySelector('ul');

        btn.onclick = function() {
            if(text.value == ''){
                alert('您还没有输入内容');
                return false;
            }
            else{
                
                var li = document.createElement('li');
                li.innerHTML = text.value + "<a href='javascript:;'>删除</a>";
                ul.insertBefore(li,ul.children[0]);

                var as = document.querySelectorAll('a');
                for(var i=0;i < as.length;i++){
                    as[i].onclick = function() {
                        ul.removeChild(this.parentNode);
                    }
                }
            }
        }


    </script>
   
    
</body>
</html>